[ibis-macro] Re: A technical question on UI
- From: James Zhou <james.zhou@xxxxxxxxxx>
- To: "Arpad_Muranyi@xxxxxxxxxx" <Arpad_Muranyi@xxxxxxxxxx>, IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
- Date: Wed, 18 Apr 2012 15:28:35 -0700
Hi Arpad,
My understanding about Walter's comment at yesterday's meeting on this issue is
that, bit_time MUST be passed as seconds and, all other parameters can be
passed in either seconds or UI (the choice of the model creator).
I think this makes sense and should be the right way to interpret the
Specification. Basically the EDA tool MUST pass the absolute bit_time (in
second) at least in one occasion to the DLL before other parameters can use the
UI unit. And bit_time is the only parameter to achieve this.
A related comment on sample_interval, the 5.0 Specification hinted but did not
clearly say that this should be a unitless fraction number. It would be better
to clarify the unit of sample_interval as well. Because the term "interval"
suggests it has the dimension of time (second).
Regards,
James
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Muranyi, Arpad
Sent: Wednesday, April 18, 2012 3:09 PM
To: IBIS-ATM
Subject: [ibis-macro] A technical question on UI
Hello everyone,
An interesting question was raised in the Editorial Committee meeting
this morning, and I got the AR to write an email on this reflector
to solicit for some comments and feedback.
The question is revolving around parameters which are expressed in
terms of UI (unit interval). A statement was made in the Editorial
Committee meeting this morning, that if a parameter is a
Reserved_Parameter, the tool will know what to do with it because
all Reserved_Parameters are completely described in the specification.
However, if the parameter is a Model_Specific parameter, the EDA
tool will have to convert the value from UI to time and pass the
time value to the AMI executable model.
For example, if the bit time is 400e-12 (ps) and the UI value is
0.5 for a certain parameter, the EDA tool would have to pass
200e-12 to the DLL, and not 0.5.
(Please correct me if this summary is not accurate).
This surprised me, because I don't recall anything in the IBIS-AMI
specification that states that the EDA tool has to convert parameters
expressed in UI to time and pass the time value to the DLL. If I
were writing the simulation software, I would just pass 0.5 to the DLL.
Does anyone have any comments on how this is supposed to be handled
by the EDA tool?
Once we have consensus on that question, the next question will be
whether we can correct/clarify this as part of the Editorial
Committee, or whether a BIRD is necessary to address this question.
Thanks in advance for the comments,
Arpad
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